Electronics Forum | Thu Jul 18 12:05:19 EDT 2002 | yngwie
Experts, Today I received PCB in a punctured vacuum seal bag. the Humidity indicator change the colour to pink at 60%RH mark. The brd finish is Entek. Earlier our intention to get the board vacuum seal is because we want to ensure that the is no fr
Electronics Forum | Thu Oct 01 16:46:50 EDT 1998 | Dave F
We are trying to eliminate/minimize the baking process for high lead-count ICs. We would like to reseal packages containing these parts to minimize exposure to humidity. Anyone have or know of a way to reseal or vacuum pack parts? Any suggested eq
Electronics Forum | Wed May 16 11:49:52 EDT 2007 | stepheniii
You want Moisture Barrier Bags (MBB). It is possible you are calling these bags, standard anti-static bags. If you can see anything through the bag, they are not what you want to use for vacuum sealing. In any case make sure you get MBBs.
Electronics Forum | Wed May 16 13:40:19 EDT 2007 | slthomas
"I read a study a while back by IBM that showed too strong a vacuum would cause too much moisture to enter the bags." That's what the nitrogen is for. If you pull a vacuum w/o backfilling with something dry, like nitrogen, pretty soon the vacuum ove
Electronics Forum | Wed May 16 17:36:42 EDT 2007 | slthomas
Can't you schedule the bake to coincide with the production run so it just becomes part of the process flow?
Electronics Forum | Wed May 16 11:37:56 EDT 2007 | aj
Hi all, Are there special type bags which you need to use for Vacuum sealing Boards/tray parts etc. or are they just the standard anti-static bags ? aj...
Electronics Forum | Wed May 16 12:40:49 EDT 2007 | realchunks
Hi Stephen, What if you used an anti-stat bag with a desiccant inside? Would this be the same affect? Sorry to ask a question over another question - just curious.
Electronics Forum | Wed May 16 14:16:21 EDT 2007 | realchunks
Oh sorry. Let me try again.... If I seal a desiccant in an ESD bag and such says, would it be the same standard such affect?
Electronics Forum | Wed May 16 13:02:12 EDT 2007 | slthomas
Moisture barrier bags are polymer coated foil so are nearly gas impermeable. There's always some coating left at the weld (or it wouldn't stick) so they're not completely sealed but that's as good as it gets. Usually people use the vacuum to remove
Electronics Forum | Wed May 16 14:23:58 EDT 2007 | stepheniii
For a day or a week probably. Possibly a month. But I"m sure not for a year or such. There would be too many variables to know exactly how long it would be before the desicant became saturated. And it wouldn't meet the Jedec standard.
